France centre Jonathan Danty is a doubt to face New Zealand in next week's Rugby World Cup opener due to a hamstring injury, the French Rugby Federation (FFR) said on Wednesday.
La Rochelle's Danty, 30, will undergo further tests over the coming days before the hosts play the All Blacks on 8 September.
Danty won his 23rd test cap on Sunday, scoring in the warm-up win over Australia, and has become a leading figure in Fabien Galthie's side.
"After the France game against Australia, Jonathan Danty underwent extra tests which showed a slight problem with his hamstring," the FFR said.
"Next week, a training schedule will be adapted to his situation."
Bulldozing midfielder Danty could be replaced in the starting line-up by Bordeaux-Begles' Yoram Moefana or Arthur Vincent of Montpellier.
France are already without flyhalf Romain Ntamack for the whole tournament due to a serious knee injury and tight-head prop Cyril Baille for at least their first two games with a calf strain.
After playing New Zealand, Les Bleus face Uruguay, Namibia and Italy in Pool A.